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Nr.78

16 February 2012

Key to the Palaearctic species of the genus Hercostomus Loew

{Diptera, Dolichopodidae)
3. Part 1

O.O. Selivanova, O.P. Negrobov, N.A. Nechay, O.O. Maslova 2

Abstract: Key to the Palaearctic species of the genus Hercostomus Loew (Diptera,
Dolichopodidae) 3. Part. Cesa News 78: 1-6.

Key of species of the third part (femur yellow, postocullar bristles black) of the genus Hercostomus
Loew is composed for Palaearctic Region. For the first time, 16 species are added in this key:
Hercostomus flaviventris Smirnov et Negrobov, Hercostomus nemorum Smirnov et Negrobov,
Hercostomus beijingensis Yang, Hercostomus gansuensis Yang, Hercostomus wudangshanus
Yang, Hercostomus xiaolongensis Yang et Saigusa, Hercostomus acutangulatus Yang et Saigusa,
Hercostomus leptocercus Stack., Hercostomus klowdeni Olejnicek, Hercostomus silvestris Pollet,
Hercostomus blankaartensis Pollet, Hercostomus helveticus Pollet, Sybistroma setosa Schiner,
Sybistroma nodicornis Mg., Ludovicius sinaiensis Grichanov, Ludovicius miricornis Parent.
Keywords: Dolichopodidae, Hercostomus, key, Palaearctic Region.

Introduction

The previous keys of the genus Hercostomus Loew, 1857 were composed by T. Becker (1917)
and A.A. Stackelberg (1934) for the Palaearctic Region, by O. Parent (1938) for France and
Palaearctic Region, by O. P. Negrobov and A.A. Stackelberg (1969) for the European part of Russia,
D'Assis Fonseca (1978) for Great Britain, M. Pollet (1990) for the Western Europe, M. Pollet and F.
Rampazzi (2003) for the Switzerland, I.Ya. Grichanov (2006, 2007) for North Europe, Caucasus
and East Mediterranean.

1 Has been supported by grant number 1 1-04-0 1051 -a from the Russian Fund for Basic Research.

2 Biological-Soil Sciences Faculty, Voronezh State University, Universitetskaya pi. 1, Voronesh, 394006, Russia. E-mail: negrobov(5) list.ru

Received on 11 February,20i2; accepted on 12 February, 20 12.

Nr. 78 CesaNews 16 February 2012

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Key l part (antennae, postocullar bristles and femur yellow) of the genus Hercostomus was
publish in the article O.P. Negrobov, N.A. Nechay, O.O. Maslova (2008), key 4 part (postocullar
bristles yellow, femur black), was publish in the article O.P. Negrobov, N.A. Nechay (2009a), key
part 5 (postocullar bristles black, femur black) was publish in the article O.P. Negrobov, N.A.
Nechay (2009b).

These keys include representatives of the subgenus Gymnopternus Loew, which occupies
vague systematic position. Some scientists give status to the subgenus Gymnopternus Loew as the
genus (Aldrich, 1896; Corpus, 1989; Curran, 1933; Foote et all, 1965; Robinson, 1970; Yang, 2005).
Some specialists of the fauna of the Palaearctic region unite these genuses in Hercostomus Loew
(Becker, 1917; Stackelberg, 1930; Parent, 1938; D'Assis-Fonseca, 1978, Negrobov, 1979).

These keys include representatives of the third group this genus which have following
characters: femur yellow, postocullar bristles black (Stackelberg, 1934; Parent, 1938).

After the revision of the genus Hercostomus Loew of Palaearctic region Stackelberg (1934)
there were described some new species. Y.S. Smirnov et O.P. Negrobov (1979) described from this
group two new species from Japan (Hercostomus flaviventris Smirnov et Negrobov, Hercostomus
nemorum Smirnov et Negrobov), D. Yang (1996a, 1996b, 1997), D. Yang and T. Saigusa (2001) -
five species from China (Hercostomus beijingensis Yang, Hercostomus gansuensis Yang,
Hercostomus wudangshanus Yang, Hercostomus xiaolongensis Yang et Saigusa, Hercostomus
acutangulatus Yang et Saigusa), A.A. Stackelberg (1949) - two species from Tajikistan
(Hercostomus paradoxopterus Stack., Hercostomus leptocercus Stack.), M. Pollet (1990, 2004) -
three species from Europe (Hercostomus silvestris Pollet, Hercostomus blankaartensis Pollet,
Hercostomus helveticus Pollet), J. Olejnicek (2002) - one species from Korea (Hercostomus
klowdeni Olejnicek).

The key of this group composed by A.A. Stackelberg contains 17 species of males and 17
species of females. One species (Hercostomus chalybeus Wied.) was transferred to new genera
Ethiromyia Brooks (Brooks, 2005). The species Hercostomus paradoxopterus Stack, was not
added in the key on female because it is not enough data in its description.

The key of females of the genus Hercostomus Loew includes representatives of the genus
Sybistroma Meigen (Sybistroma setosa Schiner, Sybistroma nodicornis Mg.) and Ludovicius
Rondani (Ludovicius sinaiensis Grichanov, Ludovicius miricornis Parent), which don't differ from
females of the genus Hercostomus Loew.

This paper contains keys of 28 species of males and 26 species of females. Separately, 16
species are added in this key for the first time.

Key of genus Hercostomus Loew.
3. part

Males

[1] 4-th joint of fore tarsi expanded 2

- Fore tarsi simple 4

[2] 3-d joint of fore tarsi not expanded H. sinicus Stack.

- 3-d joint of fore tarsi expanded 3

[3] l-st joint of fore tarsi expanded on the apex, triangular at the basement and in apical
parts, black, in middle part light H. paradoxopterus Stack.

- l-st joint of fore tarsi simple, cylindrical H. chetifer Walk.

[4] Palp with spike on the apex 5

- Palp on apex without spike 6

[5] Femur darkened from dorsal side H. (Gymnopternus) silvestris Pollet

- Femur entirely yellow H. (Gymnopternus) blankaartensis Pollet

[6] Femur partially darkened 7

- Femur entirely yellow 8

[7] Femur, fore tibia in most part black H. griseifrons Beck.

- Femur, fore tibia in most part yellow H. rivulorum Stack.

[8] Scutellum without hairs 9

2

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- Scutellum covered by hairs 15

[9] Hypopygium yellow H.flaviventris Smirnov et Negrobov

- Hypopygium dark 10

[10] Cerci biramous, with long and thin lobes. Lateral lobe striate, brown, with long and
strong black hairs on external margin, near the apex in light hairs; medial lobe narrow dark-
yellow, without hairs, slightly helical banded H. leptocercus Stack.

- Cerci uniramouse 11

[11] Thorax and abdomen metallic-green 12

- Thorax partially yellow. Abdomen metallic-green, lateral sides of tergits I-II yellow

H. acutangulatus Yang et Saigusa

[12] Hind coxae black H. gansuensis Yang

- Hind coxae yellow 13

[13] Postpedicel is very short, its length equal to its height at the basement, blunt 14

- Postpedicel is long, its length in 1,8 times longer then its height at the basement,

sharp H. beijingensis Yang

[14] Middle coxae yellow H. xiaolongmensis Yang et Saigusa

- Middle coxae dark H. wudangshanus Yang

[15] Antennae partially yellow 16

-Antennae entirely black 18

[16] Costa on the first section weakly but clearly thicken H. zieheni Parent

- Costa not thicken 17

[17] R 4+5 and M i+2 converging to the apex H. ussurianus Stack.

- R 4+5 , Mi+2 parallel at the apex H. (Gymnopternus) congruens Beck.

[18] Costa on the first section thicken 19

- Costa not thicken 22

[19] Hind coxae light-yellow H. (Gymnopternus) pseudoceler Stack.

- Hind coxae dark in the most part 20

[20] Costa thicken, that thickening takes about 2/3 of width of costal cell

H. (Gymnopternus) celer Mg.

- Costa slightly thicken 21

[21] Face white H. (Gymnopternus) brevicornis Staeg.

- Face brown H. (Gymnopternus) klowdeni Olejnicek

[22] Face violet-black H. (Gymnopternus) aerosus Fll.

- Face silvery-white or gray 23

[23]Facegray 24

- Face silvery- white 25

[24] Antennae black. Metanotum nitid. Section between R 2+3 and R^ in 1.5 times longer then
section between R 4+5 and Mi +2 . Apical section of M 3+4 approximately in 2 times longer then
hind transverse vein H. daubichensis Stack.

- Antenna dark-brown. Metanotum in white pollen. Section between R 2+3 and R 4+5 in 2 times
longer then section between R 4+5 and M 1+2 . Apical section of M 3+4 approximately in 1.5 times

longer then hind transverse vein H. nemorum Smirnov et Negrobov

[25] Hind transverse vein lies a little to apex from the middle of the wing. Apical section of
Mi+2 shorter then the main, apical section of M 3+4 shorter then the half of the main section of
the same vein H. (Gymnopternus) metallicus Stann.

- Hind transverse vein lies closer to the basement from the middle of the wing. Apical section
of Mi+ 2 longer then the main, apical section of M 3+4 longer then half of the main section of the

same vein 26

[26] Cerci ochre-yellow H. (Gymnopternus) blankaartensis Pollet

- Cerci mainly dark 27

[27] Fore coxae mainly dark 28

- Fore coxae light-yellow 29

[28] Fore, hind femur clearly obscured on the posterodorsal side, hind tibia entirely yellow
H. (Gymnopternus) silvestris Pollet

- All femur yellow, hind tibia slightly or strongly darkened on the apex

H. (Gymnopternus) assimilis Staeg.

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[29] All tibia and femur light-yellow. Clypeus without hairs and little protuberant

H. (Gymnopternus) helveticus Pollet

- Tibia and femur light-yellow except of middle femur, which from the ventral side with light-
gray pollen. Clypeus not protuberant H. rohdendorfi Stack.

Females

[I] Scutellum without hairs 2

- Scutellum covered with hairs 9

[2] Femur partially darkened 3

-Femur yellow 7

[3] Palp and proboscis yellow H. chetifer Walk.

- Palp and proboscis dark (from brown to black) 4

[4] Femur yellow, middle, hind femur with black apex 5

- Femur rusty- red or rusty-brown, hind femur on the apex black H. griseifrons Beck.

[5] Middle tibia with long undulate apicoventral setae equal in length to
basitarsus Ludovicius sinaiensis Grichanov

- Middle tibia without long undulate apicoventral setae 6

[6] Middle tibia with 4 anterodorsal bristles, 4 posterodorsal bristles H. rivulorum Stack.

- Middle tibia with 3 anterodorsal bristle, 2 posterodorsal bristle, 1 anteroventral

bristle H. rohdendorfi Stack.

[7] Coxae entirely yellow 8

- Middle coxae with a narrow median stripe dark brown....//, xiaolongmensis Yang et Saigusa

- Fore coxae dark H. leptocercus Stack.

[8] Antennae entirely black H.flaviventris Smirnov et Negrobov

- Antennae reddish-yellow. Postpedicel infuscate from above and at the apex

Ludovicius miricornis Parent

[9] Antennae partially yellow 10

-Antennae entirely black 12

[10] Clypeus convex Sybistroma nodicornis Mg.

- Clypeus normal 11

[II] Antennae reddish Sybistroma setosa Schiner

- Antennae mainly dark, scape from below yellow H. ussurianus Stack.

[12] Costa on the first section usually thicken 13

- Costa not thicken 16

[13] Epistoma without long hairs 14

- Epistoma covered with long hairs 15

[14] Frons and face in ample green-gray pollination

H. (Gymnopternus) klowdeni Olejnicek

Face light-gray, frons metallic-green, in ample brownish-gray

pollination H. (Gymnopternus) pseudoceler Stack.

[15] Epistoma covered with long light hairs H. (Gymnopternus) celer Mg.

- Epistoma covered with long dark hairs H. (Gymnopternus) brevicornis Staeg.

[16] Clypeus with short hairs 17

- Clypeus without hairs 18

[17] Fore, hind femur clearly obscured on the posterodorsal side

H. (Gymnopternus) aerosus Fll.

- All femur yellow H. (Gymnopternus) metallicus Stann.

[18] Femur partially obscured 19

- All femur yellow 21

[19] Fore, hind femur clearly obscured on the posterodorsal side
H. (Gymnopternus) silvestris Pollet

- Middle femur obscured on the apex 20

[20] Hind femur yellow H. rohdendorfi Stack.

- Hind femur obscured on the apex H. nanus Macq.

[21] Hind tibia clearly obscured on the apex H. (Gymnopternus) assimilis Staeger

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- Hind tibia yellow 22

[22] Hind tarsus entirely yellow H. (Gymnopternus) blankaartensis Pollet

- Hind tarsus dark 23

[23] Clypeusflat 24

- Clypeus protuberant H. (Gymnopternus) helveticus Pollet et Rampazzi

[24] Metanotum in gray pollen nearly dull H. wudangshanus Yang

- Metanotum metallic-green, brilliant H. daubichensis Stack.

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Pollet M. & F. Rampazzi. 2003. Gymnopternus helveticus, a new dolichopodid species from

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Nr. 78 CesaNews 16 February 2012

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Contents: O.O. Selivanova, O.P. Negrobov, N.A. Nechay, O.O. Maslova, Key to the Palaearctic species of the
genus Hercostomus Loew (Diptera, Dolichopodidae) 3. Part p. 1 - Editorial, p. 7.

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